Gorovaya E.A., Semenchenko A.A.
Far Eastern Entomologist 2026; (553): 1-16
The larva, subimago, and female imago of a mayfly of the genus Baetis are described. The presence of spatulate setae on the tergites, antennal segments, the femora and the paraprocts of the larva determines the affiliation of B. moneronensis sp. n. with the subgenus Rhodobaetis. Bunches of long pine needlelike setae on the pedicel indicate its similarity to B. thermicus. Larvae of both species have two apical setae on the claws, which contradicts one of the characteristics of the subgenus Rhodobaetis. Bayesian analysis of a DNA barcode of the new species revealed that the B. moneronensis sp. n. belongs to the B. thermicus clade, which is subdivided into five distinct molecular operational taxonomic units (mOTUs) based on ASAP analysis. Interspecific K2P distances between B. moneronensis sp. n. and lineages within the B. thermicus complex averaged 12.1%. The assignment of new species to the thermicus-group is considered proven, while its belonging to the subgenus Rhodobaetis may be disputed
